What is the past tense of log out?

Is it logout or log off?

When spelled as one word, "logout" and "log-out" are a noun or adjective that describes the components required to sign out of an account. As two words, "log out" is a verb that describes the action of signing off from an account.

Is logged out correct?

Both log off and logged off are correct, provided that you use them correctly in a sentence. Which is correct, log out or logged out? Both.

Is logged in correct?

Log in is a verb, while login is a noun. You say you need to log in and the login was not successful. To answer to your question, the correct phrases are logged-in and to log in.

What is meant by logged out?

Definition of log out intransitive verb. : to terminate a connection with a computer or system Suddenly my cursor was able to bring down the missing icons; I was able to log in and log out; and everything was copacetic.—